The draft of chimneys



(No Model.) A

J. O. SGHAEFER.

APPARATUS PORINGREASING THE DRAFT 0F GHIMNEYS. No. 258,133. Patented May16, 1882.

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UNITED STATES PATENT QFFIGE,

JOHN o. SOHAEAFEIQOF NEW Yon-K, N. Y., ASSIGNOR or TWO-THIRDS TOKLAUSMANN & MAYER, or SAME PLACE.

APPARATUS FOR INCREASING THE DRAFT OF CHIMNEYS.

SPECIFICATION forming part of Letters Patent No. 258 ,133,-dated May 16,1882.

Application filed February 21, 1852. (No model.)

To all whom it may concern:

Be it known that 1, JOHN G. SGIIAEFER, a

citizen of the United States, residing at New York, in the county andState of New York,

have invented new and useful Improvements in Apparatus for Increasingthe Draft of Chimneys, of which the following is a specification.

. The object of this invention is to provide an improved means forincreasing the draft in a steam-boiler furnace. This object I accomplishby the combination and arrangement of devices illustrated in theaccompanying draw-.

' 2 the pipe to into the coil 1), is here dried or superheated andpasses into the steanrnozzle D,

which by preference I construct as follows:'

a header-piece, 0, connecting a number of short pipes, d, which areprovided with small 0 perforations 0, through which the thoroughlydrysteam escapes up the chimney'F, causing an upward rush of air, therebyincreasing the draft, a more intense heat in the furnace, and

a corresponding increase of pressure in the bOilGI'.

In the old method, where exhaust-steam is used for a similar purpose,the-steam rapidly condenses on mixing with the air in the chimneyand-precipitates sufficientmoistureagainst 40 the Walls to cause thelatter to crumble-and eventually destroy them. Even where live steam isused the effect is the same,though in a slightly-less degree.

In my apparatus the steam is rendered so 5 light and dry that it willpass through the chimney, carrying the air with itbefore it can can besufficiently cooled to deposit moisture against the chimney-walls.

In order to provide simple and efficient means for automaticallyregulating or control ling'the passageof steam from the steam-dome tothe superheating-coil, I provide the pipe a with aregulatingmechanism,E,whieh is compos'ed-essent ially of two valves, f and i,arran ged in the pipe. (4, and of suitable construction, said valvesbeing connected with the ends of a horizontal lever, g, pivoted at h ona standard, g. The valvefis so weighted, as atf, that when the pressurein the boiler rises above thedesired limit it'raises the end of thelever g, which turns on a fulcrum, h, closing the valve 2', so as tocheck the jets of steam escaping through the steam-nozzle D sulficientlyto reduce the draft and make the fires under the boilerburnloweruntilthepressureagain comes within the desired limit.

I do not wish to be understood as broadly claiming a nozzle to injectsuperheated steam in the fine or chimney for increasing the draft in theboiler-fines or in the boiler-furnace.

hat I claim as new, and desire to secure by Letters Patent, isit Thecombination, with the boiler, steamdome, chimney, and su'perheating-eoil1;, arranged above the boiler and connected at one end by a pipe, (I,with the steam-dome and at the other with a steam-nozzle in the chimney,of the automatic regulator E, connected with the pipe to between thesteam-dome and superheating-coil, and composed'essentially of thepivoted lever g and valves tandf, oonnected with the ends of the lever,substantially as and for the purposes described.

In testimony whereof I have hereunto set my hand and seal in thepresence of two sub scribing witnesses.

JOHN G. SGHAEFER. [12 s] Witnesses:

W. HAUFF,

WILLIAM MILLER.

